Update app.py

app.py

@@ -45,8 +45,9 @@ def pdf_changes(pdf_doc):
 
 
 def query(history, text):
-    result = qa({'question': text, 'chat_history': history})
-    new_history = history + [tuple((text,result['answer']))]
+    langchain_history = [(msg[1], history[i+1][1] if i+1 < len(history) else "") for i, msg in enumerate(history) if i % 2 == 0]
+    result = qa({"question": text, "chat_history": langchain_history})
+    new_history = history + [(text,result['answer'])]
     return new_history,""
 
 css="""